S-91670A583 5/16"-18 x 1" ASTM A574 Left-Hand Threaded Alloy Steel Socket Head Screws
Left-Hand Threaded Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, maintaining secure connections in dynamic environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in demanding industrial conditions.
- Left-hand UNC coarse threading allows for specialized counter-clockwise tightening, ideal for applications where standard threads may loosen.
- Fully threaded design ensures consistent clamping force along the entire length, improving load distribution and joint integrity.
- Hex socket drive enables high-torque installation with standard tools, facilitating efficient assembly and maintenance.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting rigorous industry standards.
Professional Applications & Engineering Value
Engineered for industrial applications requiring robust and reliable fastening, these left-hand thread socket head cap screws solve critical challenges in machinery, automotive, and heavy equipment. The black-oxide alloy steel construction, combined with Rockwell C37 hardness, resists wear and corrosion, making them suitable for harsh environments. The UNC coarse thread with Class 3A fit ensures precise alignment and reduces the risk of cross-threading, while the left-hand direction prevents unintentional loosening in rotating assemblies. This design is ideal for components subject to reverse torque, enhancing safety and durability in high-strength fastening scenarios.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise dimensional accuracy and UNC coarse thread standards. It meets ASTM A574 manufacturing specifications for alloy steel socket head cap screws, ensuring consistent quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental and safety requirements in global industrial supply chains.
